This is the first photo of father and son Shahzada and Suleman Dawood who are missing following the disappearance of the submarine taking tourists to see the Titanic wreckage.
The 48-year-old dad, a prominent Pakistani businessman, and his son were identified as being onboard the vessel by family and colleagues.
It is understood from the vessel's operator, OceanGate Expeditions, the submarine had a 96-hour oxygen supply in case of emergencies - meaning the people on board have around two days of "life support" left.
The father and his 19-year-old son, who are both British citizens, belong to one of Pakistan's most prominent families, it is reported.
Their firm invests in agriculture, industries and the health sector, while Shahzada Dawood is also on the board of trustees for the California-based SETI Institute, which searches for extra-terrestrial intelligence, according to a news agency.
The vessel, which vanished yesterday, is used to take tourists to see the wreckage of the Titanic, which sits 12,500ft below the surface of the Atlantic Ocean off the coast of Newfoundland, Canada.
The US Coast Guard is expanding its search as concerns continue to grow for the crew on board the submersible, which went missing on a trip to see the Titanic shipwreck in the Atlantic.
It searched an area "about the size of Connecticut" overnight for the missing submarine, which has five people inside.
As the search continues this morning, the team is expanding its capabilities to be able to search under the water as well, according to US Coast Guard First District Commander Rear Admiral John Mauger.
Brit billionaire Hamish Harding was also on board the submarine-like vessel taking paying tourists to view the famous wreck, 370 miles off the coast of Newfoundland, Canada.
The adventurer, who is chairman of private plane firm Action Aviation, was on the 21ft vessel when it set off for what should have been an eight-hour trip to the bottom of the Atlantic.
Former US nuclear submarine commander David Marquet believes there is now less than a one per cent chance of the crew surviving "if they are on the bottom".
And tourist Mike Reiss took the same journey to the Titanic last year and says he's "not optimistic" about the submarine being located.
Speaking about the crew's chances of survival, he told BBC Breakfast: "I'm not optimistic just because I know the logistics of it.
An OceanGate Expeditions statement read yesterday: "We are exploring and mobilizing all options to bring the crew back safely. Our entire focus is on the crewmembers in the submersible and their families.
"We are deeply thankful for the extensive assistance we have received from several government agencies and deep sea companies in our efforts to reestablish contact with the submersible.
"We are working toward the safe return of the crewmembers."
